Wash the potatoes and cook for about 20 minutes. Stir curd cheese and mineral water until smooth. Season to taste with salt, pepper and paprika. Sort sprouts if necessary, wash and drain. Mix vinegar, salt and pepper. Whip 1 teaspoon of oil into it.
Wash and quarter the tomatoes. Wash and drain the lettuce and pluck smaller ones if necessary. Mix tomatoes, lettuce and marinade. Cut onions into rings. Wash the meat, dab dry. Heat 1 teaspoon of oil in a coated pan. Fry the meat for 4-5 minutes on each side. Season with salt and pepper. Add onion rings and fry until golden brown. Drain the potatoes and quench. Cut lengthwise.
Heat 1 teaspoon of oil in a coated pan. Fry the meat for 4-5 minutes on each side. Season with salt and pepper. Add onion rings and fry until golden brown. Drain the potatoes and quench. Cut lengthwise. Fill in quark, sprinkle with sprouts and paprika. Arrange everything